Chapter 7 Troubleshooting the Cisco IP Phone
Obtaining Status, Model, and Version Information
7-2
Cisco IP Phone Administration Guide for Cisco CallManager 3.2, Cisco IP Phones 7960/7940/7910
78-10453-04
Displaying Statistics for Current Call
If you experience problems during an active call, you can collect information
during that call. This information provides useful troubleshooting information
that might assist you in resolving these problems and preventing them from
occurring during future calls.
Cisco IP Phone 7960/7940
During the call, press the ? button twice rapidly. The following information
displays:
• RxType—Type of voice stream received (RTP streaming audio) (G.729,
G.711 u-law, G.711 A-law, or Link16k).
• RxSize—Size of voice packets (in milliseconds) in the receiving voice stream
(RTP streaming audio).
• RxCnt—Number of RTP voice packets received since voice stream was
opened (which is not necessarily identical to those received since the call
began because the call might have been placed on hold).
• TxType—Type of voice stream transmitted (RTP streaming audio) (G.729,
G.711 u-law, G.711 A-law, or Link16k).
• TxSize—Size of voice packets (in milliseconds) in the transmitting voice
stream.
• TxCnt—Number of RTP voice packets transmitted since voice stream was
opened (which is not necessarily identical to those received since the call
began because the call might have been placed on hold).
• Avg Jtr—Estimated average RTP packet jitter (dynamic delay a packet
encounters when going through the network) observed since the receiving
voice stream was opened.
• Max Jtr—Maximum jitter observed since the receiving voice stream was
opened.
• RxDisc—Number of RTP packets in the receiving voice stream that have
been discarded (bad packets, too late, and so on).
• RxLost—Missing RTP packets (lost in transit).
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